(this only happens when harsh accelerating, if you slowly accelerate the car will run fine and boost like a goodun)
I know you checked your turbo but possibly you could have turbo over boost, among your issues which will cause the engine to hesitate and miss fire before continuing (it cuts the ECU) . check your turbo control hoses for any splits or loose fittings , From experience pipes can be pushed too far into the elbows blocking flow. I take it you checked the waste gate for operation as the have been known to seize . Yorkshire GOK gave a valid suggestion , Also check your plug gaps
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